The basic physical systems of a country's or community's population, including roads, utilities, water, sewage, etc. These systems are considered essential for enabling productivity in the economy. Developing infrastructure often requires large initial investment, but the economies of scale tend to be significant.
Lesson Summary. Both phylogenetic trees and cladograms help show the relationships between different organisms, but only phylogenetic trees have branches that represent evolutionary time and amount of change. These were formerly based on physical characteristics, but are more accurately based on genetic relationships.iologists use cladograms and phylogenetic trees to illustrate relationships among organisms and evolutionary relationships for organisms with a shared common ancestor. Both cladograms and phylogenetic trees show relationships among organisms, how alike, or similar, they might be.
Fungi next to a tree in a coniferous forest. Symbiosis is the relationship between organisms, typically where both benefit. Fungi, in a coniferous forest, colonizes trees roots. The fungi produce minerals that are helpful to the tree, and the tree produces food, like carbohydrates helpful to the fungi.ungi next to a tree in a coniferous forest. Symbiosis is the relationship between organisms, typically where both benefit. Fungi, in a coniferous forest, colonizes trees roots. The fungi produce minerals that are helpful to the tree, and the tree produces food, like carbohydrates helpful to the fungi.